Programming

Top 20 open-source vector databases

Where AI apps keep their embeddings

Updated 23 min ago · GitHub stars (stars)

Why these 20

Ranked by GitHub stars: how many developers bookmarked the project. Stars measure attention, not quality, so each row also shows forks, open issues, licence and the last push.

1

Mintplex-Labs/anything-llm

Stop renting your intelligence. Own it with AnythingLLM. Everything you need for a powerful local-first agent experience

67,327 stars 7,538 forks336 open issuesJavaScriptlast push 2026-10-19MIT
2

meilisearch/meilisearch

A lightning-fast search engine API bringing AI-powered hybrid search to your sites and applications.

59,612 stars 2,748 forks322 open issuesRustlast push 2026-10-19NOASSERTION

Also in: #5 open-source databases
3

pathwaycom/serviette

A no-code RAG server that keeps answers in sync with your documents. Works with 8 vector databases. Built on Pathway.

58,787 stars 1,512 forks8 open issuesPythonlast push 2026-10-16MIT

Also in: #10 self-hosted apps
4

run-llama/llama_index

LlamaIndex is the document processing platform for AI

52,569 stars 8,383 forks995 open issuesPythonlast push 2026-10-19MIT
5

milvus-io/milvus

Milvus is a high-performance, cloud-native vector database built for scalable vector ANN search

46,435 stars 4,308 forks1,410 open issuesGolast push 2026-10-19Apache-2.0
6

volcengine/OpenViking

Self-evolving Context Database for AI Agents. Unify Agent Memory, Knowledge RAG and Skills.

40,350 stars 3,239 forks1,008 open issuesPythonlast push 2026-10-19AGPL-3.0
7

VectifyAI/PageIndex

📑 PageIndex: Document Index for Vectorless, Reasoning-based RAG

39,306 stars 3,416 forks145 open issuesPythonlast push 2026-10-19MIT
8

qdrant/qdrant

Qdrant - High-performance, massive-scale Vector Database and Vector Search Engine for the next generation of AI. Also available in the cloud https://cloud.qdrant.io/

35,140 stars 2,764 forks787 open issuesRustlast push 2026-10-19Apache-2.0
9

topoteretes/cognee

Cognee is the open-source AI memory platform for agents. Give your AI agents persistent long-term memory with small models for free

32,551 stars 3,412 forks879 open issuesPythonlast push 2026-10-19Apache-2.0
10

NirDiamant/RAG_Techniques

This repository showcases various advanced techniques for Retrieval-Augmented Generation (RAG) systems. Each technique has a detailed notebook tutorial.

29,917 stars 3,810 forks8 open issuesJupyter Notebooklast push 2026-10-17NOASSERTION
11

weaviate/weaviate

Weaviate is an open-source vector database that stores both objects and vectors, allowing for the combination of vector search with structured filtering...

16,892 stars 1,423 forks790 open issuesGolast push 2026-10-19NOASSERTION
12

memvid/memvid

Memory layer for AI Agents. Replace complex RAG pipelines with a serverless, single-file memory layer. Give your agents instant retrieval and long-term memory.

16,604 stars 1,543 forks34 open issuesRustlast push 2026-07-14Apache-2.0
13

alibaba/zvec

A lightweight, lightning-fast, in-process vector database

16,127 stars 1,014 forks87 open issuesC++last push 2026-10-19Apache-2.0
14

langchain4j/langchain4j

LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers...

13,266 stars 2,741 forks1,012 open issuesJavalast push 2026-10-19Apache-2.0
15

StarTrail-org/LEANN

[MLsys2026 Best Paper]: https://arxiv.org/abs/2506.08276. RAG on Everything with LEANN. Enjoy 97% storage savings while running a fast, accurate, and 100%...

13,037 stars 1,325 forks46 open issuesPythonlast push 2026-10-17MIT
16

neuml/txtai

💡 All-in-one AI framework for semantic search, LLM orchestration and language model workflows

13,027 stars 1,138 forks32 open issuesPythonlast push 2026-10-19Apache-2.0
17

zilliztech/claude-context

Code search MCP for Claude Code. Make entire codebase the context for any coding agent.

12,627 stars 942 forks147 open issuesTypeScriptlast push 2026-07-14MIT
18

lancedb/lancedb

Developer-friendly OSS embedded retrieval library for multimodal AI. Search More; Manage Less.

11,706 stars 1,121 forks747 open issuesRustlast push 2026-10-19Apache-2.0
19

oramasearch/orama

🌌 A complete search engine and RAG pipeline in your browser, server or edge network with support for full-text, vector, and hybrid search in less than 2kb.

10,581 stars 407 forks35 open issuesTypeScriptlast push 2026-10-18NOASSERTION
20

xerj-org/xerj

XERJ is the new way for AI to search data. Its autoindex capability activates agents to know your data without the token waste of grep (1974 tool). One...

10,470 stars 553 forks131 open issuesRustlast push 2026-10-19Apache-2.0